Description A large gray marmot with a relatively long tail. Hairs on the rump are tinged buff. The tail is brownish. Face is marked with white in front of the eyes and a dark band on snout. Dark streaks also mark the side of the head and neck. Typically hibernates from September to May.

Discussion Alpine-montane specialist except in Alaska where it ranges down to sea level, not known from north of the Yukon river. Lives in treeless meadows where rocky outcrops and talus provide burrows.